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Title: Potential ecological risk and speciation analysis of heavy metals in sediments from the Jialu River, China

Authors: Chang-Po Zhao; Xiao-Jing Zhou; Kun Dong; Jie Fu; Di-Di Zhu; Shu-Qing An; Hai-Liang Zhu

Addresses: State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing 210093, China ' State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing 210093, China ' State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing 210093, China ' Department of Environmental Science & Engineering, Fudan University, Shanghai 200433, China ' State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing 210093, China ' State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing 210093, China ' State Key Laboratory of Pharmaceutical Biotechnology, School of Life Sciences, Nanjing University, Nanjing 210093, China

Abstract: To evaluate ecological risks and existing forms of heavy metals in the Jialu River of China, sediments samples were collected from 22 sites along this river. A BCR-sequential extraction procedure was applied to analyse the chemical speciation of heavy metals (i.e., Cr, Mn, Co, Ni, Zn, Cu and Cd) in sediment samples, including acid extractable, reducible, oxidisable and residual fractions. The geo-accumulation index, risk assessment code and enrichment factor were used to evaluate the pollution situation of these heavy metals. The results showed that the speciation of Cr was mainly associated with the exchangeable fraction with a mean percentage of 54.23%. Mn and Zn mainly occurred in the reducible fraction, accounting for 42.72% and 37.71% of the total contents, respectively. Co, Ni, Cu and Cd were mainly associated with the residual fraction with mean percentages of 58.75%, 59.02% and 48.21%, respectively. The sediment samples in the lower reach had higher heavy metals levels, and Cd showed a considerable risk relative to other metals.

Keywords: Jialu River; heavy metals; geo-accumulation index; GAI; risk assessment code; RAC; BCR-sequential extraction; principal component analysis; PCA; China; ecological risks; speciation analysis; river sediments; water pollution; chromium; manganese; cobalt; nickel; zinc; copper; cadmium.

DOI: 10.1504/IJEP.2017.082700

International Journal of Environment and Pollution, 2017 Vol.61 No.1, pp.72 - 88

Available online: 07 Mar 2017 *

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